Re: 5U4GB vs. GZ34/5AR4

On Mar 27, 6:19 pm, GP <GP_notr...@xxxxxxxx> wrote:
François Yves Le Gal wrote:> On Thu, 27 Mar 2008 15:51:26 -0700, GP <GP_notr...@xxxxxxxx> wrote:

I think you are saying the 5U4GB has more sag.

It causes more sag. Yes.

 If so, what you are
saying seems to contradict the previous response to the question

T H I N K.

.  

   Come on... No reason to be insulting.  Someone just said the complete
opposite of you.  I asked a question and get two people giving
contradictory answers.    I was just trying to get clarification. If it
is such a pain for you, no response is better than an insulting one.

Unfortunately, this ng is biased toward mentally ill behavior from
angry, frustrated losers GP. There's a 'whole picture' here.

I was incorrect and I apologize- _All_things_being_equal_ you'd get
less headroom (earlier breakup), more sag/slower rise times
(compression), looser bass, and less voltage w/ a 5Y3 and more
headroom, faster response, tighter bass, and more voltage with a GZ34.
*HOWEVER!* The issue is really power level of your amp...look here;

http://www.valvette.us/tube_types.html

I was thinking SS vs. GZ34. The GZ34 produces more sag. The nice thing
about tube rectifiers is that there *are* several types.........
5AR4(=GZ34), 5V4, 5R4, 5Y3.......which will progressivley lower the
voltage and increase sag and reduce clean headroom. so there's a
'palette' to choose from. 'Sag' is really the same thing as
'compression'........it means the front edge of the note will be
reduced in relation to the back end.......less aggressive 'attack'.
Power supplies dump their energy when you strike a note/cord, the
recovery time can be fast, or slow depending on the design of the
entire circuit. With slower recovery times, you get a natural
compression when the tubes are conducting hard, and musical notes will
hold longer. The supply voltage drops when the note is played, as the
note starts to decay, the supply voltage is recovering raising the
gain back up. This is where you get compression. However, slow
recovery power supplies can cause a muddy sound, especially in lower
voltage supplies, and cathode biased output stages. When the supply
recovers fast, the attack is increased, and lower frequencies will be
tigther/bolder. If the power supply is too stiff/fast, notes will
decay quicker, and the "touch/feel/sensitivity" thing will be
lifeless.

Regards,

mvm

http://tinyurl.com/32j32m
.

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